RTTY DEMO 012710.wmv

Kelly KlaasCited 3× on HN, 2021–2025

YouTube

demo · intro · evergreen · 2021–2025 on HN

A short demonstration of radioteletype (RTTY), a digital communication mode used in amateur radio, showing what the signal sounds like.

HN commenters link it as a sound sample when discussing data-over-audio projects that resemble RTTY.

Electronics & circuit design Information theory & signal processing #rtty #hamradio #dataoversound #teletype

3 comments from Hacker News

@nickcw2025-02 · in “Ggwave: Tiny Data-over-Sound Library”

It sounds quite nice. It is also about the same bitrate as RTTY which was invented in 1922 and is still in use by radio amateurs round the world. Here is what that sounds like ▶ this video Not as musical but quite similar

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@hugs2023-01 · in “Mystery Signal from a Helicopter (2014)”

I don't have the skills of the person who decoded the signal... however, if you get your ham radio license and start playing with the various digital modes, you'll start to recognize the various sounds of different modes. An APRS data packet [1] has a very unique sound. Same with with RTTY [2]. Our brains are really good at pattern matching if they're exposed to a pattern enough times. Obviously, you'd still need a computer to decode those signals, but the "sound" of the signals can give you very good headstart. [1]: link [2]: ▶ this video

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@tdeck2021-04 · in “Show HN: I made a tool to communicate data using the PC speaker”

Wow it sounds like RTTY (radioteletype): ▶ this video I suppose there are only so many ways to modulate a data signal.

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